16758668009 has 2 divisors, whose sum is σ = 16758668010. Its totient is φ = 16758668008.

The previous prime is 16758667993. The next prime is 16758668011. The reversal of 16758668009 is 90086685761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16607992384 + 150675625 = 128872^2 + 12275^2 .

It is a cyclic number.

It is not a de Polignac number, because 16758668009 - 2⁴ = 16758667993 is a prime.

Together with 16758668011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16758668809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8379334004 + 8379334005.

It is an arithmetic number, because the mean of its divisors is an integer number (8379334005).

Almost surely, 2^16758668009 is an apocalyptic number.

It is an amenable number.

16758668009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16758668009 is an equidigital number, since it uses as much as digits as its factorization.

16758668009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The spelling of 16758668009 in words is "sixteen billion, seven hundred fifty-eight million, six hundred sixty-eight thousand, nine".